Cells are diverse in many ways including their size and functions. In cell sizes, they can range from as little as 1 micrometer to as big as 200 micrometers. One advantage of being small is the large surface to volume ratio. This ratio is important because it helps things to be moved in and out of the cell efficiently and quickly. In addition, the diffusion time to the center of the cell is a lot lower than if the cell was larger. Some cells die when they are mature in example: xylem cells. Different cells serves different purposes including red blood cells, nerve cells, rod cells, phloem cells and xylem cells.
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